need advice!

my bf ako, he is married pero nkipaghiwalay sya s asawa nya 5years ago pagdating nya gling japan, kc ngcnungaling yung aswa nya s kanya. Pinaasa sya n lhat ng pinapadala nya ay may kinapupunthan pero pgdating nya wala lahat itong naipundar at hndi nya masabi kung san dinala mga naipun nya. they have 2 kids, at kinuha ng babae yung mga bata at cnabing hndi n cla mkikita ng bf ko forever dw. wala clng communication after that then lately, may ngtxt s cp ng lola ng bf ko, anak dw nya at humihingi ng supporta. my question is, my grounds b n pwedeng gamitin for annulment??gusto ng mg pa annul ng bf ko. second, just in case, pwede bng kasuhan ng babae yung bf ko ng concubinage? where not living together, he's in taiwan a few mos ago. how about yung support nya s mga bata?

the support for the kids is his legal obligation, no question about that. Annulment? consult a lawyer para mas-maintindihan ang case nya. Concubinage? don't live in a same roof.